Geared single trolley is a simple and useful structure, easy to operate. This type is driven by chain, it can be used together with Chain hoist or other lifting products to match the composition of lifting and transporting. It can freely run in a certain radius of curvature of the I-beam track along the upper and lower wings, installed in the straight or the curve of the monorail overhead transport line or manual single-beam bridge. It is widely applicable to factories, mines, docks, shipyards, warehouses and computer room and other places to install machines, lifting goods, especially for locations with no power equipment maintenance installation.